First, welcome to the forum! All I've been able to find out is that there were four 1948 series chronographs, models 2018, silver with black strap, 2019 and 2020, which you know about, and the 2021, 18 kt gold plated with brown strap. All have the 'winged logo.' I have not been able to find out anything as far as how many runs of the 1948s were done, though an initial run of 3 models of only 200 each seems, IMHO, highly unlikely. Invicta, being a mass producer of watches, would have numbered and announced 'Limited Edition' to any run that small.
The movement is ETA and either the G10.211 or the 251.233 would be my guess, your jeweler should have been able to tell you. HTH